Fix a chaining bug in raw_seeks where seeking out of the current link  would fail due to not reinitializing the decode machinery.
Fix a chaining bug in raw_seeks where seeking out of the current link 
would fail due to not reinitializing the decode machinery.

Also correct a minor and a moderate inefficiency that reduces the 
necessary number of seek callback in a search operation by about 2/3.



git-svn-id: 03f0f1727258f1959b7b485b30a676bafdb78148@17178 0101bb08-14d6-0310-b084-bc0e0c8e3800

brion/vorbis,brion/vorbis,KTXSoftware/vorbis,Rillke/vorbis,KTXSoftware/vorbis,KTXSoftware/vorbis,jdm/vorbis,Distrotech/libvorbis,libninjam/libvorbis,Distrotech/libvorbis,pcwalton/vorbis,pcwalton/vorbis,libninjam/libvorbis,Rillke/vorbis,pcwalton/vorbis,KTXSoftware/vorbis,TitaniumEagle/libvorbis,TitaniumEagle/libvorbis,jdm/vorbis,OffByOneStudios/vorbis,wighawag/vorbis,Rillke/vorbis,brion/vorbis,TitaniumEagle/libvorbis,ShiftMediaProject/vorbis,wighawag/vorbis,Rillke/vorbis,OffByOneStudios/vorbis,ShiftMediaProject/vorbis,brion/vorbis,OffByOneStudios/vorbis,TitaniumEagle/libvorbis,OffByOneStudios/vorbis,Distrotech/libvorbis,pcwalton/vorbis,ShiftMediaProject/vorbis,libninjam/libvorbis,libninjam/libvorbis,Distrotech/libvorbis,ShiftMediaProject/vorbis,wighawag/vorbis,ShiftMediaProject/vorbis,wighawag/vorbis,jdm/vorbis,jdm/vorbis,ShiftMediaProject/vorbis,pcwalton/vorbis,jdm/vorbis